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DAG(1) General Commands Manual DAG(1) NAME dag - preprocessor for drawing directed graphs SYNOPSIS dag [ option ... ] [ file ... ] DESCRIPTION Dag is a pic(1) or PostScript preprocessor for laying out directed graphs. It does well on acyclic graphs (dags) and other graphs that can be drawn hierarchically. Graph statements are contained between .GD (node ranks increase downward) or .GR (rightward) and .GE. Edges point in the direction of increasing rank if possible; the other direc- tion is favored for edges within rank. A summary of statements fol- lows. edge from tail to head0 edge-items, to head1 edge-items, to head2 edge- items...; Create edges from the tail node to the head node(s). Nodes are created if they do not already exist. Edge-items (described below) and the noise words edge, from, to, and comma are optional. Node names may be quoted to protect blanks or keywords. ordered tail head0 head1 head2...; Make edges with heads in given left- to-right order on the same rank. May contain noise words and edge- items. path node0 node1 node2...; Make a path of edges. May contain noise words and edge-items. backedge tail head0 head1 head2...; Same as edges with opposite node ranking preferred. backpath node0 node1 node2...; Make a path of backedges. draw nodes node-items; Set properties of subsequently created nodes. Legal node-items: as shape Known shapes are Box, Circle, Doublecircle, Ellipse (de- fault), Diamond, Square, Plaintext. Other shapes may be specified within braces {} in the output language (e.g. pic) or defined; see below. label "string" Label with string instead of node name. pointsize points heightinches color "string" Hue-saturation-brightness triple; works only with Post- Script. draw nodelist node-items; Set properties of listed nodes. draw edges edge-items; Set properties of subsequently created edges. Legal edge-items: dotted, dashed, solid, invis label "string" weight n High-weight edges are kept short. Default weight 1. color "string" pointsize points minimum rank nodelist; Listed nodes must be on the topmost rank (left- most with .GR). maximum rank nodelist; Bottommost or rightmost rank. same rank nodelist; separate ranks inches how ; Set minimum separation between ranks. The optional how is exactly or equally. separate nodes inches ; The options are -O Place nodes `optimally'; practical for graphs of a few dozen nodes. -Tps Prepare output for PostScript rather than pic. -Tsimple Output similar to that of graphdraw(9.1). -Tcip Output readable by cip(9.1). -pwidthxheight,marginwidthxmarginheight Set PostScript page dimensions; marginwidth and/or marginheight may be omitted. -l Disable automatic loading of the dag graphics library. The introductory .GD or .GR line may carry optional parameters in the form .GD width height fill. Width and height are maximum values in inches; fill causes the graph to be stretched to the full dimensions. Graphics code written in the output language (pic or PostScript) may be embedded between .PS and .PE. Macros defined with three arguments--la- bel, width, and height--may be used as shape names in node-items. EXAMPLES .GD 2 2 a b c; path a x y; draw nodes as Box; a z label "hi" weight 1000; draw edges dashed; b x; same rank b x; .GE FILES default TOOLS=/usr/lib SEE ALSO pic(1), lp(1), graphdraw(9.1), psi(9.1), troff(1) E. R. Gansner, S. C. North, K. P. Vo, `DAG--A Program that Draws Directed Graphs', this manual, Volume 2 BUGS The delimiter .GD is nonstandard; it may be called .GS in installations where ped(9.1) is not used. Troff lacks dotted or dashed splines; use PostScript. Edge labels may overlap. DAG(1)